三维电Fenton深度处理煤化工废水的催化反应机理

为进一步去除煤化工废水生化出水中残留的有机污染物,采用以剩余污泥和铁泥为原材料制备的SAC-Fe作为催化粒子电极构建三维电Fenton体系深度处理煤化工废水,对过程参数进行优化,并探讨催化反应机理.结果表明:制备的SAC-Fe对煤化工废水生化出水中的污染物具有较高吸附性能,单位COD吸附容量为101.1 mg/g;采用RSM优化的三维电Fenton过程参数为电流密度16.78 m A/cm2、Fe浓度14.75 mmol/L、p H 3.92,此时TOC去除率为67.12%;通过体系内H2O2和·OH生成量分析,结合吸附作用探讨三维电Fenton深度处理煤化工废水的催化反应机理,SAC-Fe表现出较高的(电)催化活性,显著提升三维电Fenton体系内H2O2和·OH的生成量和生成速率,吸附作用提高·OH利用率和污染物降解率,进而提升三维电Fenton深度处理煤化工废水的效能.

Advanced treatment of biologically pretreated coal chemical industry wastewater by three-dimensional electro-Fenton

To further remove the organic pollutants residual in the biologically pretreated coal chemical industry wastewater, three-dimensional electro-Fenton system was established by involving Fe loaded sludge deserved activated carbon (SAC-Fe) from sewage and waste iron sludge, and was introduced in the advanced treatment of biologically pretreated coal chemical industry wastewater. Process parameters were optimized by response surface methodology (RSM) coupled with central composite design, and the catalytic reaction mechanism involved in system was discussed. Results show that SAC-Fe exhibited high adsorption performance to the pollutants in the wastewater. The maximum adsorption content calculated with Langmuir model was 101.1 mg/g. The optimal process parameters were determined as 16.78 mA/cm² of current density, 14.75 mmol/L of equivalent Fe content and pH 3.92, with the observed TOC removal efficiency of 67.12%. The catalytic reaction mechanism was discussed based on the analysis of H₂O₂ and ·OH contents and adsorption effect. SAC-Fe exhibited high electro-catalytic activity in three-dimensional electro-Fenton system. SAC-Fe as catalytic particle electrode significantly promoted the production amount and rate of H₂O₂ and ·OH. Adsorption effect improved ·OH and organics removals. Thus three-dimensional electro-Fenton with SAC-Fe as catalytic particle electrode exerted excellent performance in the advanced treatment of coal chemical industry wastewater.